have incredible energy and stamina. this is a very big setback. so much we don't know. >> including where in her body this blot is. that could have a big significance in how it's treated and the seriousness of it. >> reporter: that's true. i asked if the clot is in her head or her leg, they will not say. they have said she has other issues from the concussion but won't swhat they are. >> it's puzzling, the lack of information, given the republican charges of benghazi flu or a diplomatic illness when they were failing to believe she was as sick as she was. >> reporter: the clintons are notoriously private. they just don't say much, especially about issues like this. >> have you dealt with something like this, where there's so little information forthcoming? >> reporter: i can't say i have. over the last few weeks, they've come back at us saying you're making it sound too serious. clearly, there are serious things going on. it raises more questions when you know so very little. >> all right, thank you so much. we're joine